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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/arm64/crypto/aes-ctr-fallback.h
parentInitial commit. (diff)
downloadlinux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz
linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm64/crypto/aes-ctr-fallback.h')
-rw-r--r--arch/arm64/crypto/aes-ctr-fallback.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/arm64/crypto/aes-ctr-fallback.h b/arch/arm64/crypto/aes-ctr-fallback.h
new file mode 100644
index 000000000..c9285717b
--- /dev/null
+++ b/arch/arm64/crypto/aes-ctr-fallback.h
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+/*
+ * Fallback for sync aes(ctr) in contexts where kernel mode NEON
+ * is not allowed
+ *
+ * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <crypto/aes.h>
+#include <crypto/internal/skcipher.h>
+
+asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
+
+static inline int aes_ctr_encrypt_fallback(struct crypto_aes_ctx *ctx,
+ struct skcipher_request *req)
+{
+ struct skcipher_walk walk;
+ u8 buf[AES_BLOCK_SIZE];
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, true);
+
+ while (walk.nbytes > 0) {
+ u8 *dst = walk.dst.virt.addr;
+ u8 *src = walk.src.virt.addr;
+ int nbytes = walk.nbytes;
+ int tail = 0;
+
+ if (nbytes < walk.total) {
+ nbytes = round_down(nbytes, AES_BLOCK_SIZE);
+ tail = walk.nbytes % AES_BLOCK_SIZE;
+ }
+
+ do {
+ int bsize = min(nbytes, AES_BLOCK_SIZE);
+
+ __aes_arm64_encrypt(ctx->key_enc, buf, walk.iv,
+ 6 + ctx->key_length / 4);
+ crypto_xor_cpy(dst, src, buf, bsize);
+ crypto_inc(walk.iv, AES_BLOCK_SIZE);
+
+ dst += AES_BLOCK_SIZE;
+ src += AES_BLOCK_SIZE;
+ nbytes -= AES_BLOCK_SIZE;
+ } while (nbytes > 0);
+
+ err = skcipher_walk_done(&walk, tail);
+ }
+ return err;
+}